21938941924 has 27 divisors (see below), whose sum is σ = 39688201161. Its totient is φ = 10611173520.

The previous prime is 21938941901. The next prime is 21938941933. The reversal of 21938941924 is 42914983912.

The square root of 21938941924 is 148118.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4986901924 + 16952040000 = 70618^2 + 130200^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9182122 + ... + 9184510.

Almost surely, 2^21938941924 is an apocalyptic number.

21938941924 is the 148118-th square number.

It is an amenable number.

21938941924 is a deficient number, since it is larger than the sum of its proper divisors (17749259237).

21938941924 is an frugal number, since it uses more digits than its factorization.

21938941924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4844 (or 2422 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 52.

The spelling of 21938941924 in words is "twenty-one billion, nine hundred thirty-eight million, nine hundred forty-one thousand, nine hundred twenty-four".